doc: move filters documentation to dedicated manual page ffmpeg-filters

doc/Makefile

@@ -2,7 +2,7 @@ DOCLIBS-$(CONFIG_AVUTIL)  += libavutil
 DOCLIBS-$(CONFIG_AVCODEC) += libavcodec
 DOCLIBS-$(CONFIG_AVFILTER) += libavfilter
 
-COMPONENTS=$(PROGS-yes) ffmpeg-codecs
+COMPONENTS=$(PROGS-yes) ffmpeg-codecs ffmpeg-filters
 
 MANPAGES    = $(COMPONENTS:%=doc/%.1)    $(DOCLIBS-yes:%=doc/%.3)
 PODPAGES    = $(COMPONENTS:%=doc/%.pod)  $(DOCLIBS-yes:%=doc/%.pod)

doc/ffmpeg-filters.texi

@@ -0,0 +1,29 @@
+\input texinfo @c -*- texinfo -*-
+
+@settitle FFmpeg Filters Documentation
+@titlepage
+@center @titlefont{FFmpeg Filters Documentation}
+@end titlepage
+
+@top
+
+@contents
+
+@include filters.texi
+
+@ignore
+
+@setfilename ffmpeg-filters
+@settitle FFmpeg filters
+
+@c man begin SEEALSO
+ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavfilter(3)
+@c man end
+
+@c man begin AUTHORS
+See Git history (git://source.ffmpeg.org/ffmpeg)
+@c man end
+
+@end ignore
+
+@bye

doc/libavfilter.texi

@@ -17,15 +17,13 @@ framework containing several filters, sources and sinks.
 
 @c man end DESCRIPTION
 
-@include filters.texi
-
 @ignore
 
 @setfilename libavfilter
 @settitle multimedia filtering library
 
 @c man begin SEEALSO
-ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavutil(3), libavcodec(3)
+ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), ffmpeg-filters(1)
 @c man end
 
 @c man begin AUTHORS